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Additionally, since thumbnails are automatically created for each image, we will clean up the thumbnail storage area for the image being deleted. Note that this is quite easy, since we prefixed all generated thumbnails with their database ID. Listing 11-34 shows the postDelete() function as it should be added to DatabaseObject_ BlogPostImage in ./include/DatabaseObject. First, we use unlink() to delete the main image from the filesystem. Next, we use the glob() function, which is a useful PHP function for retrieving an array of files based on the specified pattern. We loop over each of the files in the array and unlink() them. Listing 11-34. Deleting the Uploaded File and All Generated Thumbnails (BlogPostImage.php) < php class DatabaseObject_BlogPostImage extends DatabaseObject { // ... other code public function preDelete() { unlink($this->getFullPath()); $pattern = sprintf('%s/%d.*', self::GetThumbnailPath(), $this->getId()); foreach (glob($pattern) as $thumbnail) { unlink($thumbnail); } return true; } // ... other code } > Now when you call the delete() method on a loaded blog post image, the filesystem files will also be deleted. Remember to return true from postDelete() otherwise the SQL transaction will be rolled back. The other method we must add to this class is one that gives us the ability to load an image for a specified blog post. This is similar to the loadForUser() function we implemented for blog posts. We do this so that only the logged-in user will be able to delete an image on their blog posts. Listing 11-35 shows the code for the loadForPost() function, which is also added to BlogPostImage.php. Listing 11-35. Restricting the Load of Images to a Particular Blog Post (BlogPostImage.php) < php class DatabaseObject_BlogPostImage extends DatabaseObject

[a-zA-Z]\w*\d+\w*

This password starts with a letter character, followed by zero or more word characters, one or more digits, and then zero or more word characters. In short, it forces a password to contain one or more numbers somewhere inside it. You could use a similar pattern to require two numbers or any other special character. Like the password example, this allows four to ten characters, but it allows special characters (asterisks, ampersands, and so on). A sequence of three, two, then four digits, with each group separated by a dash. You could use a similar pattern when requiring a phone number.

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You saw in the DetailsView example earlier that you can manually change the mode for the Web control by calling the ChangeMode() method. This also works for the FormView. You have a LinkButton on the page that allows the user to add a new Player to the database. In its Click event handler, you change the mode to Insert: protected void LinkButton1_Click(object sender, EventArgs e) { FormView1.ChangeMode(FormViewMode.Insert); } And you switch the FormView back into ReadOnly mode if the user selects a different Player: protected void GridView1_SelectedIndexChanged(object sender, EventArgs e) { FormView1.ChangeMode(FormViewMode.ReadOnly); } This is exactly the same as you saw for the DetailsView. What you don t need to do when using the FormView is turn the New link on and off. Since you have no way of automatically adding buttons to a FormView, you explicitly specify the actions that you allow the user to take within the definition of the InsertItemTemplate and the EditItemTemplate.

{ // ... other code public function loadForPost($post_id, $image_id) { $post_id = (int) $post_id; $image_id = (int) $image_id; if ($post_id <= 0 || $image_id <= 0) return false; $query = sprintf( 'select %s from %s where post_id = %d and image_id = %d', join(', ', $this->getSelectFields()), $this->_table, $post_id, $image_id ); return $this->_load($query); } // ... other code } > Now that these changes have been made to DatabaseObject_BlogPostImage, we can implement the non-Ajax version of deleting an image. To do this, we simply need to implement the delete part of imagesAction() in BlogmanagerController.php. Remember that we left a placeholder for this when we originally created this method in Listing 11-5. The code used to delete an image is shown in Listing 11-36. Listing 11-36. Deleting an Image from a Blog Post (BlogmanagerController.php) < php class BlogmanagerController extends CustomControllerAction { // ... other code public function imagesAction() { // ... other code else if ($request->getPost('delete')) { $image_id = (int) $request->getPost('image'); $image = new DatabaseObject_BlogPostImage($this->db); if ($image->loadForPost($post->getId(), $image_id)) { $image->delete();

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The one thing missing from all of the examples that you ve seen so far is validation. Nothing stops you, at the moment, from entering invalid data. You saw in 8 that you can use various validation Web controls to force the user to enter valid data before any changes to the database are attempted.

$this->messenger->addMessage('Image deleted'); } } // ... other code } } > If you now click on the Delete button below an image, the image will be deleted from the database and filesystem, and a message will appear in the top-right flash messenger when the page reloads.

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* You have many different ways to validate e-mail addresses with regular expressions of varying complexity. See http://www.4guysfromrolla.com/webtech/validateemail.shtml for a discussion of the subject and numerous examples.

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